Multiple Choice
Which of the following best describes how increasing temperature affects the rate of a chemical reaction?
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15. Chemical Kinetics
Factors Influencing Rates
Multiple Choice
Which of the following factors would speed up the rate of a chemical reaction?
A
Adding an inert gas at constant volume
B
Decreasing the concentration of reactants
C
Increasing the temperature
D
Lowering the surface area of a solid reactant
Verified step by step guidance1
Understand that the rate of a chemical reaction depends on factors that increase the frequency and energy of collisions between reactant molecules.
Analyze the effect of adding an inert gas at constant volume: Since the volume is constant, the partial pressures (or concentrations) of reactants do not change, so the reaction rate remains essentially unchanged.
Consider decreasing the concentration of reactants: Lowering concentration reduces the number of collisions per unit time, which slows down the reaction rate.
Examine increasing the temperature: Raising temperature increases the kinetic energy of molecules, leading to more frequent and more energetic collisions, which generally speeds up the reaction rate.
Evaluate lowering the surface area of a solid reactant: Reducing surface area decreases the available area for collisions, thus slowing down the reaction rate.
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